CN106273529A - A kind of polytetrafluoroethylfiber fiber film - Google Patents
A kind of polytetrafluoroethylfiber fiber film Download PDFInfo
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- CN106273529A CN106273529A CN201510273746.4A CN201510273746A CN106273529A CN 106273529 A CN106273529 A CN 106273529A CN 201510273746 A CN201510273746 A CN 201510273746A CN 106273529 A CN106273529 A CN 106273529A
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Abstract
The present invention relates to the preparation method of a kind of polytetrafluoroethylfiber fiber film.The preparation method of a kind of polytetrafluoroethylfiber fiber film of the present invention it be characterised by the most first interlude having been carried out prestretched.Polytetrafluoroethylfiber fiber film can be made to be more uniformly distributed with stretching, and quality is improved.The invention belongs to polytetrafluoroethylfiber fiber film technical field.
Description
Technical field
The present invention relates to the preparation method of a kind of polytetrafluoroethylfiber fiber film and for the pre-stretching device of this preparation method,
Belong to the plant equipment manufacturing technology field of politef.
Background technology
Prepare in the prior art of polytetrafluoroethylfiber fiber film the most ripe with pulling method.nullA kind of method for producing polytef amosite as described in the Chinese invention patent of application number 200610026648.1，It selects 100% politef to be raw material，Employ screw expeller、Calender、Stretching-machine、Add heat stretching machine、Cutting machine、Twisting mill、Extrusion stretching machine、The process equipments such as winder，Manufacture by the following method: first put into politef at screw expeller and extrude，The operating temperature of screw expeller is 325～420 DEG C、Rotating speed is 3～100r/min，Calender calendering is entered after screw expeller，The operating temperature of calender is 10～50 DEG C、Linear velocity is 0.5～1m/min，Subsequently enter stretching-machine stretching，Stretching-machine operating temperature is 10～50 DEG C、Linear velocity is 0.3～1.2m/min，Subsequently enter and add heat stretching machine
nullAdd hot-stretch，Adding heat stretching machine operating temperature is 130～190 DEG C、Linear velocity is 0.4～1.5m/min，After enter back into add heat stretching machine heating stretching，Adding heat stretching machine operating temperature is 190～220 DEG C、Linear velocity is 0.5～1.1m/min，Then pass through cutting machine to cut，Cutting machine linear velocity is 1～2m/min，After twisted bunchy by twisting mill，Twisting mill linear velocity is 1.1～2.1m/min，Subsequently enter extrusion stretching machine and implement rough，Extrusion stretching machine operating temperature is 30～80 DEG C、Linear velocity is 4～6m/min，After enter back into extrusion stretching machine and carefully draw，Extrusion stretching machine operating temperature is 80～120 DEG C、Linear velocity is 6～15m/min，Finally enter and add heat stretching machine heating stretching，Adding heat stretching machine operating temperature is 160～265 DEG C、Linear velocity is 5～15m/min，Then by winder rolling，I.e. obtain politef long fibre finished product.Above-mentioned patent has related to producing of raw material band, and the drawing process for this raw material band.In the prior art, first pass through extruder and squeeze out bar-shaped politef strip, then this strip is rolled into raw material band by calender.Often there is stretching uneven situation stretching when in this raw material band, and prepared film not only air-moisture-permeable amount himself intensity little is the highest.Air-moisture-permeable amount and film strength are one group of contradiction, and this is techniques known.The generally the thinnest air-moisture-permeable of film is effective, but its intensity difference；Film the thickest air-moisture-permeable weak effect, but its intensity is high.Good product will ensure certain air-moisture-permeable effect, also ensure certain intensity.Therefore, the polytetrafluoroethylfiber fiber film often insufficient strength that prepared by prior art or air-moisture-permeable weak effect.
Summary of the invention
It is an object of the invention to as solving above-mentioned technical problem, it is provided that a kind of polytetrafluoroethylfiber fiber film.
The above-mentioned technical purpose of the present invention has the technical scheme that
A kind of preparation method of polytetrafluoroethylfiber fiber film, it comprises the following steps:
1. mixing: being mixed into low surface tension lubricating oil in ptfe micropowder, addition is ptfe micropowder quality
10～30%；
2. screening: above-mentioned batch mixing is sieved with 10～30 mesh sieves；
3. preforming: screened batch mixing is placed at a temperature of 20～40 DEG C 20～28 hours；
4. extrusion: using extruder to be extruded by the raw material of above-mentioned preforming, squeezing parameter is as follows, extruded velocity 5～15mm/
Min, extrudes diameter 15～25mm, and membrana oralis draw ratio L/D is 20～40, cone angle 30～50 °, compression ratio 140～160；
5. calendering: use calender to roll the raw material after extrusion, during calendering, roller temperature controls is 140～180 DEG C；
Prepare raw material band；
6. except lubricant: to described raw material band dried at a temperature of the boiling point of a little higher than described low surface tension lubricating oil
18～24 hours, remove described low surface tension lubricating oil；
7. prestretched: the raw material band removing low surface tension lubricating oil is carried out horizontal middle prestretched；
8. drawing and setting: the raw material band through prestretched is carried out cross directional stretch first, first thermal finalization, secondary cross directional stretch,
Second heat is shaped, and prepares polytetrafluoroethylfiber fiber film after second heat sizing；Control parameter during drawing and setting as follows, the most laterally draw
Stretch speed 10～60mm/s, draw ratio 2～10, first heat setting temperature 200～250 DEG C；Secondary cross directional stretch is that the raw material band after cross directional stretch first is redrawn 50～200 times, rate of extension 40～100 mm/s, and it is 250～300 DEG C that second heat setting temperature controls.
The result obtained after prior art analysis is by the present inventor, and raw material band of the prior art is pars intermedia when stretching
Position level of stretch is inadequate, and proximal edge stretching transition, the became uneven which results in film is even；Owing to mid portion is blocked up, because of
This air-moisture-permeable weak effect, and edge stretching transition, therefore its intensity does not reaches requirement.And the present inventor improves technology,
The step of prestretched is added so that the middle part being difficult in prior art be stretched is stretched in advance before stretching, then
Ensuing stretching step can be effectively improved the situation that stretching is uneven.Polytetrafluoroethylfiber fiber film is made to stretch the most equal
Even, quality is improved.
Preferred as technique scheme, in extrusion step, controls squeezing parameter as follows, extruded velocity 5～
15mm/min, extrudes diameter 15～25mm, and membrana oralis draw ratio L/D is 20～40, cone angle 30～50 °, compression ratio 140～160.
Preferred as technique scheme, in drawing and setting step, controls parameter as follows, first horizontal stroke during drawing and setting
To rate of extension 10～
60mm/s, draw ratio 2～10, first heat setting temperature 200～250 DEG C；Secondary cross directional stretch is that the raw material band after cross directional stretch first is redrawn 50～200 times, rate of extension 40～100 mm/s, and it is 250～300 DEG C that second heat setting temperature controls.
Preferred as technique scheme, in pre-stretching step, described prestretched multiplying power is 2～5 times.
Preferred as technique scheme, described interlude is 1/3 to 2/3 part in the middle of raw material band.
Preferred as technique scheme, in pre-stretching step, the interlude of described raw material band carries out horizontal prestretching
Stretch the edge then cross directional stretch being to use pressure roller to push down interlude.
Preferred as technique scheme, in pre-stretching step, the interlude of described raw material band carries out horizontal prestretching
Stretch is to use to carve the cross directional stretch that threaded roller is carried out.
The method have the advantages that
The present invention have passed through pre-stretching step, can be effectively improved polytetrafluoroethylraw raw material band tensile force of each several part when stretching
Uniform distribution, also can change the microstructure of polytetrafluoroethylraw raw material band simultaneously so that it is the intensity at each position and air-moisture-permeable effect
Fruit all tends to unifying and reach an ideal degree.
Accompanying drawing explanation
Fig. 1 is the prestretched schematic diagram of the embodiment of the present invention one；
Fig. 2 is the prestretched schematic diagram of the embodiment of the present invention two.
This specific embodiment is only explanation of the invention, and it is not limitation of the present invention, people in the art
The present embodiment can be made after reading this specification by member as required does not has the amendment of creative contribution, but as long as at this
All protected by Patent Law in the right of invention.
Embodiment one
A kind of polytetrafluoroethylfiber fiber film, it makes through following steps:
1. mixing: being mixed into low surface tension lubricating oil in ptfe micropowder, addition is ptfe micropowder quality
15%；
2. screening: above-mentioned batch mixing is sieved with 20 mesh sieves；
3. preforming: screened batch mixing is placed at a temperature of 30 DEG C 24 hours；
4. extrusion: using extruder to be extruded by the raw material of above-mentioned preforming, squeezing parameter is as follows, extruded velocity 10mm/min, squeezes
Going out diameter 20mm, membrana oralis draw ratio L/D is 30, cone angle 40～°, compression ratio 150；
5. calendering: use calender to roll the raw material after extrusion, during calendering, roller temperature controls is 160 DEG C；Prepare raw
Material strip；
6. except lubricant: at a temperature of the boiling point of a little higher than described low surface tension lubricating oil, described raw material band is dried place
Reason, removes described low surface tension lubricating oil；
7. prestretched: the raw material band removing low surface tension lubricating oil is carried out horizontal middle prestretched；
8. drawing and setting: the raw material band through prestretched is carried out cross directional stretch first, first thermal finalization, secondary cross directional stretch,
Second heat is shaped, and prepares polytetrafluoroethylfiber fiber film after second heat sizing；Control parameter during drawing and setting as follows, the most laterally draw
Stretching speed 20mm/s, draw ratio is 5, first heat setting temperature 200 DEG C；Secondary cross directional stretch is that the raw material band after cross directional stretch first is redrawn 100 times, rate of extension 80 mm/s, and it is 250 DEG C that second heat setting temperature controls.
As shown in Fig. 1, it is the limit using pressure roller to push down interlude that the interlude of described raw material band carries out horizontal prestretched
Edge then cross directional stretch.Described interlude is 1/3 to 2/3 part in the middle of raw material band.
Embodiment two
A kind of polytetrafluoroethylfiber fiber film, it makes through following steps:
1. mixing: being mixed into low surface tension lubricating oil in ptfe micropowder, addition is ptfe micropowder quality
15%；
2. screening: above-mentioned batch mixing is sieved with 20 mesh sieves；
3. preforming: screened batch mixing is placed at a temperature of 30 DEG C 24 hours；
4. extrusion: using extruder to be extruded by the raw material of above-mentioned preforming, squeezing parameter is as follows, extruded velocity 10mm/min, squeezes
Going out diameter 20mm, membrana oralis draw ratio L/D is 30, cone angle 40～°, compression ratio 150；
5. calendering: use calender to roll the raw material after extrusion, during calendering, roller temperature controls is 160 DEG C；Prepare raw
Material strip；
6. except lubricant: at a temperature of the boiling point of a little higher than described low surface tension lubricating oil, described raw material band is dried place
Reason, removes described low surface tension lubricating oil；
7. prestretched: the raw material band removing low surface tension lubricating oil is carried out horizontal middle prestretched；
8. drawing and setting: the raw material band through prestretched is carried out cross directional stretch first, first thermal finalization, secondary cross directional stretch,
Second heat is shaped, and prepares polytetrafluoroethylfiber fiber film after second heat sizing；Control parameter during drawing and setting as follows, the most laterally draw
Stretching speed 20mm/s, draw ratio is 5, first heat setting temperature 200 DEG C；Secondary cross directional stretch is that the raw material band after cross directional stretch first is redrawn 100 times, rate of extension 80 mm/s, and it is 250 DEG C that second heat setting temperature controls.
As shown in Fig. 2, it is to use threaded roller at quarter to carry out that the interlude of described raw material band carries out horizontal prestretched
Cross directional stretch.Described interlude is 1/3 to 2/3 part in the middle of raw material band.
Comparative example
A kind of preparation method of polytetrafluoroethylfiber fiber film, it comprises the following steps:
1. mixing: being mixed into low surface tension lubricating oil in ptfe micropowder, addition is ptfe micropowder quality
15%；
2. screening: above-mentioned batch mixing is sieved with 20 mesh sieves；
3. preforming: screened batch mixing is placed at a temperature of 30 DEG C 24 hours；
4. extrusion: using extruder to be extruded by the raw material of above-mentioned preforming, squeezing parameter is as follows, extruded velocity 10mm/min, squeezes
Going out diameter 20mm, membrana oralis draw ratio L/D is 30, cone angle 40～°, compression ratio 150；
5. calendering: use calender to roll the raw material after extrusion, during calendering, roller temperature controls is 160 DEG C；Prepare raw
Material strip；
6. except lubricant: at a temperature of the boiling point of a little higher than described low surface tension lubricating oil, described raw material band is dried place
Reason, removes described low surface tension lubricating oil；
8. drawing and setting: the raw material band removing low surface tension lubricating oil is carried out cross directional stretch first, first thermal finalization,
Secondary cross directional stretch, second heat is shaped, and prepares polytetrafluoroethylfiber fiber film after second heat sizing；Parameter is controlled such as during drawing and setting
Under, cross directional stretch speed 20mm/s first, draw ratio is 5, heat setting temperature 200 DEG C first；Secondary cross directional stretch is that the raw material band after cross directional stretch first is redrawn 100 times, rate of extension 80 mm/s, and the control of second heat setting temperature is
250℃。
Following table show the Data Comparison table of the product that the embodiment of the present invention three prepares with comparative example
In upper table, owing to the extensograph parameter of embodiment Yu comparative example is identical, so its total level of stretch is close, it is total
Air-moisture-permeable amount be more or less the same, but its intensity difference, be mainly manifested in elongation at break and hot strength.This is also
Illustrate the polytetrafluoroethylfiber fiber film that the intensity of the polytetrafluoroethylfiber fiber film of the present invention is prepared more than prior art.This be by
Stretching in the present invention is more uniformly distributed.And it is little to stretch whether uniform with total porosity relation, also with total air-moisture-permeable amount
It is more or less the same.From microcosmic, the size difference in each aperture of polytetrafluoroethylfiber fiber film prepared by the present invention is relatively little, and shows
The difference in each aperture of polytetrafluoroethylfiber fiber film having technology to prepare is bigger.
In upper table, vapor transfer rate uses GB/T12704-1991 moisture absorption method to measure；Air permenbility uses GB/T
5453-1997 enters
Row is measured；The computational methods of elongation at break are as follows:
Elongation at break=△
L/L0*100%, former long L0, under axial tension effect, the breaking length after deformation is L, in
It is extension at break △ L=L-L0；
The computational methods of hot strength are as follows:
σ t=p/(b × d), σ t are hot strength (MPa)；P is peak load (N)；B is specimen width (mm)；
D is sample thickness (mm).
Claims (7)
1. a polytetrafluoroethylfiber fiber film, it is characterised in that it is made through following steps:
1. mixing: be mixed into low surface tension lubricating oil in ptfe micropowder；
2. screening: above-mentioned batch mixing is sieved with 10～30 mesh sieves；
3. preforming: screened batch mixing is placed at a temperature of 20～40 DEG C 20～28 hours；
4. extrusion: use extruder to be extruded by the raw material of above-mentioned preforming；
5. calendering: use calender to roll the raw material after extrusion, during calendering, roller temperature controls is 140～180 DEG C；
Prepare raw material band；
6. except lubricant: at a temperature of the boiling point of a little higher than described low surface tension lubricating oil, described raw material band is dried place
Reason, removes described low surface tension lubricating oil；
7. prestretched: the interlude of the raw material band removing low surface tension lubricating oil is carried out horizontal prestretched；
8. drawing and setting: the raw material band through prestretched is carried out cross directional stretch first, first thermal finalization；Then secondary is carried out
Cross directional stretch, second heat is shaped, and prepares polytetrafluoroethylfiber fiber film after second heat sizing.
2. according to a kind of polytetrafluoroethylfiber fiber film described in claim 1, it is characterised in that: in extrusion step, control to squeeze
Pressure parameter is as follows, extruded velocity 5～15mm/min, extrudes diameter 15～25mm, and membrana oralis draw ratio L/D is 20～40, cone
Angle 30～50 °, compression ratio 140～160.
3. according to a kind of polytetrafluoroethylfiber fiber film described in claim 1, it is characterised in that: in drawing and setting step, draw
Parameter is controlled as follows when stretching sizing, cross directional stretch speed 10～60mm/s first, draw ratio 2～10, thermal finalization temperature first
Spend 200～250 DEG C；Secondary cross directional stretch is that the raw material band after cross directional stretch first is redrawn 50～200 times, draws
Stretching speed 40～100 mm/s, it is 250～300 DEG C that second heat setting temperature controls.
4. according to a kind of polytetrafluoroethylfiber fiber film described in claim 1, it is characterised in that: in pre-stretching step, described pre-
Stretching ratio is 2～5 times.
5. according to a kind of polytetrafluoroethylfiber fiber film described in claim 1, it is characterised in that: described interlude is raw material
1/3 to 2/3 part in the middle of band.
6. according to a kind of polytetrafluoroethylfiber fiber film described in claim 1, it is characterised in that: in pre-stretching step, described life
It is the edge then cross directional stretch using pressure roller to push down interlude that the interlude of material strip carries out horizontal prestretched.
7. according to a kind of polytetrafluoroethylfiber fiber film described in claim 1, it is characterised in that: in pre-stretching step, described life
It is to use to carve the cross directional stretch that threaded roller is carried out that the interlude of material strip carries out horizontal prestretched.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510273746.4A CN106273529A (en) | 2015-05-27 | 2015-05-27 | A kind of polytetrafluoroethylfiber fiber film |
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| CN201510273746.4A CN106273529A (en) | 2015-05-27 | 2015-05-27 | A kind of polytetrafluoroethylfiber fiber film |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109847970A (en) * | 2018-12-25 | 2019-06-07 | 于丽娟 | A kind of soft equipment of new material processing |
| CN113844141A (en) * | 2021-09-23 | 2021-12-28 | 上海索康医用材料有限公司 | Expanded polytetrafluoroethylene surgical isolating membrane and manufacturing process thereof |
-
2015
- 2015-05-27 CN CN201510273746.4A patent/CN106273529A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109847970A (en) * | 2018-12-25 | 2019-06-07 | 于丽娟 | A kind of soft equipment of new material processing |
| CN109847970B (en) * | 2018-12-25 | 2020-12-08 | 博兴融智科技创新发展有限公司 | New material processing is with soft equipment |
| CN113844141A (en) * | 2021-09-23 | 2021-12-28 | 上海索康医用材料有限公司 | Expanded polytetrafluoroethylene surgical isolating membrane and manufacturing process thereof |
| CN113844141B (en) * | 2021-09-23 | 2023-09-15 | 上海索康医用材料有限公司 | Expanded polytetrafluoroethylene surgical isolation membrane and manufacturing process thereof |
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